Self Studies
Self Studies
Self Studies
Self Studies

Cell The Unit of Life Test - 17

Result Self Studies

Cell The Unit of Life Test - 17
  • Score

    -

    out of -
  • Rank

    -

    out of -
TIME Taken - -
Self Studies

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Self Studies Self Studies
Weekly Quiz Competition
  • Question 1
    1 / -0
    A centrosome is
    Solution
    Centrioles are minute submicroscopic subcylindrical structures which usually occur in pairs (hence, the term diplosome) inside a specialised cytoplasmic structure called centrosphere of the centrosome. Centrioles are present in animal cells only.
  • Question 2
    1 / -0
    The "master mind" of the cell is
    Solution
    • The nucleus controls protein synthesis and is the genetic repository of a cell. 
    • Hence, the nucleus can be called as the mastermind of cell.
    • Thus, option C is correct.
  • Question 3
    1 / -0
    DNA of mitochondria is present in which of the following?
    Solution
    • A substance enclosed by the inner membrane of mitochondria and carries various respiratory enzymes. 
    • The matrix of a mitochondrion contains DNA, RNA, ribosomes (55S to 70S), lipids, granules of calcium phosphate, manganese, etc. and enzymes of the Krebs cycle. 
    • DNA is generally circular. It is naked with or without association with histones. 
  • Question 4
    1 / -0
    Which one of the following is not a non-protoplasmic inclusion?
    Solution
    Cell Inclusions are non-living ergastic or paraplasmic substances present in the cytoplasm. They may be food reserve or excretory substance or pigment or mineral. Due to their presence, a cell may become different from other surrounding cells. it is then called as an idioblast. The food reserve cell inclusions can be starch, glycogen, fat droplets and aleurone grains. Mineral crystals can be of calcium salts. Calcium carbonate occurs as a mass of crystals around a cellulose core to form cystolith. Cystolith is like a bunch of grapes, e.g., leaf hypodermis of the banyan tree. Calcium oxalate forms needle-shaped raphides e.g.,Lemna, Eichhornia etc., prismatic crystals, e.g., scales of onion, star-shaped sphaeraphide or druse eg. Colocasia, Chenopodium or powdery mass called as crystal sand as in Atropa. Mitochondria is a double membrane bound cell organelles concerned with the process of aerobic respiration. Thus, the correct answer is option D.
  • Question 5
    1 / -0
    Which of the following is called as suicidal bags?
    Solution
    • Lysosomes are called suicide bags because in the case of adversity they digest their own cell. They have hydrolytic enzymes that get activated at pH 4.8.
  • Question 6
    1 / -0
    Which of the following is the smallest in size?
    Solution
    Ribosomes are primary site of protein synthesis or translation and measure 20 nm.
    Lysosomes or "suicidal bags" of the cell measure 200 nm.
    Mitochondria, the powerhouse of the cell are site of cellular respiration measures 3000 nm
    Chloroplast are site of photosynthesis and measures 5000 nm.
    Therefore, ribosomes are smallest of all.
  • Question 7
    1 / -0
    Nucleus is surrounded by a 
    Solution
    In eukaryotic organisms, the nucleus has five parts - nuclear envelope, nucleoplasm, nuclear matrix, chromatin, and nucleolus. The nuclear envelope is also called as karyotheca. It is made up of two membranes, the outer membrane may have ribosomes and interconnections with the ER and the inner membrane is connected with the nucleoplasm.
    Hence the correct option is B.
  • Question 8
    1 / -0
    Fill in the blanks.

    A series of membrane enclosed channels studded with ribosomes are called as______________.
    Solution

    • The endoplasmic reticulum is a network of membranes found throughout the cell and connected to the nucleus. 
    • It is of two types RER and SER. Rough ER (RER) is the endoplasmic reticulum attached to the ribosome and thus involves the formation and transportation of proteins. 
    • Smooth ER (SER) is the endoplasmic reticulum devoid of the ribosome and involved in the production and transportation of lipids and steroids. 
    • It is smooth because it is not studded with ribosomes and is associated with smooth slippery fats.

  • Question 9
    1 / -0
    Protoplasm cytoskeleton is made by 
    Solution
    Endoplasmic Reticulum was discovered by Porter and collaborators in 1945. It was given the present name by Porter in 1953. The endoplasmic reticulum is a system of membrane-lined channels found in all eukaryotic cells except mature erythrocytes provides structural support to the protoplasm.
  • Question 10
    1 / -0
    The infoldings of the inner membrane of mitochondria is referred to as___________
    Solution

    Cristae are folds in the inner membrane of a mitochondrion that increases its surface area for chemical reactions to occur and gives the inner mitochondrial membrane its characteristic wrinkled shape. It is the site of aerobic cellular respiration and has important proteins attached on it, including ATP synthase and a variety of cytochromes.

    The answer is (D) Cristae.
Self Studies
User
Question Analysis

  • Correct -

  • Wrong -

  • Skipped -

My Perfomance
  • Score

    -

    out of -
  • Rank

    -

    out of -
Re-Attempt Weekly Quiz Competition
Self Studies Get latest Exam Updates
& Study Material Alerts!
No, Thanks
Self Studies
Click on Allow to receive notifications
Allow Notification
Self Studies
Self Studies Self Studies
To enable notifications follow this 2 steps:
  • First Click on Secure Icon Self Studies
  • Second click on the toggle icon
Allow Notification
Get latest Exam Updates & FREE Study Material Alerts!
Self Studies ×
Open Now